Screw operated bushing and bearing installing and removing tool with pivotal grippers on said screw and having impact means



A. ULLMO SHING AND BEARING INSTALLIN SCREW OPERATED BU AND REMOVING TOOL WITH PIVOTAL GRIPPERS 0N SAID SCREW AND HAVING IMPACT MEANS Aug. 22, 1967 Filed June 50, 1966 IN V EN TOR.

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nited States Patent Ofifice 3,336,652 Patented Aug. 22, 1967 3,336,652 SCREW OPERATED BUSHING AND BEARING IN- STALLIN G AND REMOVING TOOL WITH PIV- OTAL GRIPPERS N SAID SCREW AND HAVING IMPACT MEANS Andre Ullrno, 2244 Cranston Road,

University Heights, Ohio 44118 Filed June 30, 1966, Ser. No. 561,873 1 Claim. (Cl. 29-254) This invention relates to assembly and disassembly apparatus and particularly to a percussion tool for removing or inserting bearings and bushings of varied diameter.

Conducive to a better understanding of the invention it may be well to point out that bearings and bushings are seated through press fits.

Drifts are ordinarily used to remove and install such units by carefully and progressively locating the drift at different positions around the circumference of the bearing or bushing and tapping it out of, or into, place.

Unless extreme care is taken the hearing or bushing may be cocked and jammed, resulting in a deformed structure. This is particularly true in the removal of bearings or bushings that have become corroded, and require the application of considerable force to start them from their seats.

It will be apparent that the prior art method requires considerable skill on the part of the mechanic, as well as being time consuming.

The primary object of the invention, therefore, is to provide a durable, compact, and universal percussion tool for removing or inserting bearings, bushings, and the like, that will quickly, easily and safely remove or install bearings and bushings of various diameters.

Another object is to provide a percussion tool for removing or inserting bearings, bushings, and the like, of various diameters, having a plurality of expandable and contractable work-engaging, force transmitting, jaws that maintain parallel relationship to one another in all possible conditions of expansion or contraction.

A further object is to provide a percussion tool, of the type stated, having a plurality of work-engaging, force transmitting, jaws that exert their pulling or pushing action, simultaneously and uniformly, in straight lines parallel to the central axis of the bearing or bushing being operated upon.

It will not be here attempted to set forth and indicate all of the various objects and advantages incident to the invention, but other objects and advantages will be referred to in or else will become apparent from-that which follows.

The invention will appear more clearly from the following detailed description when taken in connection with the accompanying drawing, showing by way of example a preferred embodiment of the inventive idea, wherein like numerals refer to like parts throughout.

In the drawing forming part of this application:

FIGURE 1 is a side elevational view of the bushing and bearing installing and removing tool, that is the subject of the invention, showing it with its work-engaging jaws in their fully expanded condition;

FIGURE 2 is a side elevational view of the same, with a portion broken away, showing the work-engaging jaws in their fully contracted condition;

FIGURE 3 is a top plan view of the jaws, in their fully contracted condition;

FIGURE 4 is a side elevational view of the jaw mounting spider assembly, with the work-engaging jaws removed;

FIGURE 5 is a side elevational view of one of the unmounted work-engaging jaw-s;

FIGURE 6 is a view, partly in section, showing the jaws engaged with the inner race of a ball bearing assembly, in their hearing pulling position; and,

FIGURE 7 is a view, partly in section, showing the jaws engaged with the inner race of a ball bearing assembly, in their hearing pushing, or inserting position.

Referring more particularly to the drawing, there is seen in FIGURE 1 the bushing and bearing installing and removing tool, that is the subject of this invention, broadly indicated by reference numeral 10.

Reference numeral 11 indicates a solid body shaft having a handle 13 at its lower end and a threaded section 17 at its upper end. A cylindrical hammer 14 is .slidably mounted on the shaft 11 for free reciprocal travel between stops 15 and 16.

A rotatable disc 18, threadedly mounted on section 17 of the shaft 11, is freely movable between adjusted positions the length of said threaded section.

Reference numeral 12 indicates a spider assembly having a hub 43 and two sets of spaced, radially extending arms 20 and 22.

The three arms of each set 20 and 22 are angularly disposed 120 apart on the hub 43, as is seen most clearly in FIGURE 4. The spider assembly 12 is mounted at the upper end of the shaft, forming a continuation thereof, by means of screw 19.

Each arm 20 has a jaw receiving slot 21, with link-pin bores 24 proximate the innner ends thereof.

Each arm 22 has a jaw receiving slot 23, vertically aligned with the corresponding slots of the arms 20, immediately above it. Each arm 22 also has link-pin bores 24 proximate the inner end of its slots 23.

Referring to FIGURE 5 there is seen a side elevation of one of the jaws 30 in its unmounted condition. As seen in FIGURES 1, 2 and 3 there are three work engaging jaws 28, 29 and 30 of identical configuration, so only one jaw need be described in detail.

Each jaw is cut from a single piece of rigid sheet steel of a thickness to snugly interfit the spider arm slots 21 and 23 in sliding engagement, when mounted in place, as described hereinafter. Each jaw has a base end with a slot 32 cut therein, at to its long axis, of a width to snugly fit over the adjusting disc 18 in radial sliding engagement with the upper and lower surfaces thereof, when assembled, as seen in FIGURES l and 2.

Reference numeral 37 indicates a laterally extending gripper-finger, located proximate the upper end of the jaw and spaced downwardly therefrom to define first and second work-gripping surfaces 38 and 39, respectively. As explained hereinafter, the work-piece by the first gripper surface 38 is for pushing action and by the second gripper surface 39 for pulling action.

Reference numerals 33 and 34 indicate two spaced link-pin bores, and reference numerals 35 and 36 indicate two spaced notches which provide clearance for the jaws relative to the inner ends of the spider arm slots 21 and 23, when the jaws are in their fully retracted condition, shown in FIGURE 2.

The jaws 28, 29 and 30 are slots 21 disc 18.

The jaws are connected to the arms 20 and 22 through rigid links 25, pivotally connected to the arms through anchoring pins 26 fitted through the arm bores 24; and pivotally joined to jaws 28, 29 and 30 through anchoring pins fitted through the jaw bores 33 and 34.

The so mounted jaws 28, 29 and 30 are held parallel to the projected axis of the shaft 11 by the links 25, and are movable longitudinally thereof, upon rotation of the disc 18, between the fully advanced, or expanded, position shown in FIGURE 1, and the fully retracted, or contracted, position shown in FIGURE 2.

mounted in the spider arm and 23 with their base slots 32 fitted over the A study of FIGURES 1 and 2 will show that each jaw 28, 29 and 30, connected to the spider assembly 12, through the link 25, defines one side of a parallelogram, all of whose opposed sides are maintained parallel as the jaws approach or move away from the spider hub 43 and shaft 11.

It will also be seen that rotation of the disc 18 from the position shown in FIGURE 2 to that of FIGURE 1 will cause jaws 28, 29 and 30 to travel forward of the shaft 11. At the same time the forward movement of the jaws will cause all the links 25 to pivot outwardly, forcing the jaws to move away from the axis of the shaft 11, while always maintaining the jaws parallel to the shaft axis, as their parallelogram configuration is maintained.

Thus, the diametrical spacing between the jaws 28, 29 and 30 can be infinitely varied between adjusted positions by rotation of the disc 18, with the jaws rigidly maintained in parallel relation to each other and the shaft 11.

FIGURES 6 and 7 illustrate a ball bearing assembly 40 mounted against a seat 42 in a shaft bore of a structure 41.

In using the tool 10 to insert bearing 40, as shown in FIGURE 7, the disc 18 is rotated to contract the jaws 28, 29 and 30 to a point whereat they can be inserted into the inner bearing race, with the first surface 38 of the gripper fingers 37 seated against the bearing race.

. The disc 18 is then rotated in the opposite direction to expand the jaws into pressed engagement with the bearing race. Holding the tool by its handle 13, the hammer 14 is drawn against the stop 15 and then sharply moved along the shaft until it strikes the stop 16, causing a percussion action that pushes the bearing into position on the seat 42. If necessary, the hammering action is repeated until the bearing is driven home.

In removing a bearing, the tool is made to assume the position illustrated in FIGURE 6, wherein the jaws are first contracted and inserted through the bearing and then expanded until the second surface 39, of the gripper finger 37 presses against the lower face of the bearing. With the tool again held by the handle 13, the hammer is drawn against the stop 16 and then sharply moved along the shaft 11 against the stop 15, causing a percussion action that pulls the bearing away from its seat 42.

During both the pushing and pulling operation of the tool the three jaws are held in parallel relation and engage the bearing squarely and firmly, so that straight line pressure or pull is directed against the bearing being operated upon, with no lateral thrust. Thus, there is no possibility of tilting, jamming or deforming the bearing regardless of the force necessary to insert or remove it.

Furthermore, the three jaws are easily adjustable, relative to each other, for firm and uniform engagement with workpieces of various diameters, by simply rotating the positioning disc 18.

While the tool 10 has been described as having 3 jaws, for optimum performance, it could be made with only two diametrically opposed jaws.

It will now be evident that little or no skill is required to operate the tool since once positioned the pushing or pulling forces are applied uniformly circumferentially of the workpiece.

Only a few blows of the hammer 14 are required to start the most stubborn bearing from its seat, making for economical operation, with assurance that no deformation of the bearing will occur while it is being removed.

It will thus be seen that any object of circular configuration, whether a bushing, bearing, sleeve, or liner, may be easily, quickly and safely installed or removed with the tool.

While the invention has been disclosed in its preferred form, it is to be understood that the specific embodiment thereof as described and illustrated herein is not to be considered in a limited sense, as there may be other forms or modifications of the invention which should also be construed to come within the scope of the appended claim.

I claim:

A bushing and bearing installing and removing tool, comprising in combination:

(a) a rigid shaft member having a handle end and a threaded end,

(b) a spider member mounted at the threaded shaft end, forming a continuation thereof, and having two sets of axially spaced, paired, angularly disposed and radially extending, slotted arms; the slot of each of the paired arms being axially aligned with that of its mate,

(c) a control disc rotatably mounted on the shaft thread, movable axially thereof toward and away from the spider member,

(d) a hammer member slidably mounted on the shaft for free reciprocal, percussive, movement lengthwise thereof between a first stop, positioned proximate the shaft thread, and a second stop, positioned proximate the shaft handle,

(e) a plurality of elongated jaw members, having outer and inner edges, mounted in opposition circumferentially of the shaft, one in each of the paired spider arms,

(f) each jaw member having a control disc engaging slot, open to its inner edge, cut at 90 to its long axis, proximate its lower end; and a gripper-finger, spaced downwardly of its upper end, extending laterally of its outer edge at 90 thereto, to define first and second work-piece gripping surfaces,

(g) each jaw being mounted on the shaft member with the control disc rotatably fitted in the jaw slot and the jaw slidably held in the slots of its associated paired arms through parallel, pivot-able, link members which define two sides of a parallelogram of which the shaft and jaw form the third and fourth sides,

(h) the opposed jaws being simultaneously adjustable, radially of the axis of the shaft, by rotation of the control disc between adjusted positions, whereby the jaws are moved longitudinally of the shaft causing the attached parallel link members to tilt radially of the shaft and shift the opposed jaws between contracted and expanded positions, parallel to longitudinal axis of the shaft, for engagement with work-pieces of various diameters,

(i) the hammer member being movable forwardly of the shaft, against the first stop, to deliver percussive force to the jaw gripper-fingers and drive in a workpiece engaged by the first surfaces of said fingers; the hammer member being movable rearwardly of the shaft, against the second stop, to deliver percussive force to the jaw gripper-fingers and pull out a workpiece engaged by the second surfaces of said fingers.

References Cited UNITED STATES PATENTS 1,888,800 11/1932 Grothe 29-246 1,893,414 1/1933 Johnson et al 29-26l X 2,096,345 10/1937 Schrem 29261 2,136,004 11/1938 COrnwell 29-261 2,170,461 8/1939 Pepperdine 29261 X WILLIAM FELDMAN, Primary Examiner.

MYRON C. KRUSE, Examiner. 

